Artificial tooth.



S. H. POLLOGK.

ARTIFICIAL TOOTH.

APPLICATION FILED JULY 1a, 1913.

Patnted June 9, 191i Inventor:

Attorneys UNITED STATES PATENT OFFICE.

SAMUEL H. POLLOCK, OF ROCKY FORD, COLORADO.

ARTIFICIAL TOOTH.

Specification of Letters Patent.

Patented June 9, 19214.

Application filed July 18, 1913. Serial No. 779,807.

larly to what has become known inthe art as a porcelain crown.

It is the object of the present invention to provide novel and improvedmeans for anchoring the crown to the root or stub of a tooth.

Another object of the present invention is to provide a crown adapted tobe anchored to a root, and so constructed, that a bridge may be readilysoldered or attached thereto for supporting another tooth or a pluralityof teeth.

A further object of the present invention is to provide a device of thenature indicated which will provide a comparatively strong and eflicienttooth, the construction being relatively simple and inexpensive, and thecrown being readily applicable to different roots.

WVith the foregoing general objects outlined and with other objects inview, which will be apparent as the nature of the invention is betterunderstood, the invention resides in the combination and arrangement ofparts and in the details of construction hereinafter described andclaimed, it being understood that changes in the precise embodiment ofthe invention herein disclosed, can be made within the scope of what isclaimed, without departing from the spirit of the invention.

The invention has been illustrated in its preferred embodiment in theaccompanying drawing, wherein Figure l is a side elevation of theimproved crown. Fig. 2 is a front view of the crown. Fig. 3 is a rear orlingual view of the crown. Fig. i is a sectional view of the crown asapplied to a root. Fig. 5 is a perspective view of the body portion ofthe crown. Fig. 6 is a perspective View of the backing of the crown.Fig. 7 is a perspective view of the crown pin.

In carrying out the present invention, there is provided a body portionor crown proper 1 of porcelain or other refractory material, and whichis commonly termed a porcelain crown. The basal portion of the crown 1is relatively large, or is of a contour. approximately the same as thatof the base of the root, while the free or outer portion of the crownhas a cutting edge similar to an anterior tooth. The back or lingualside of the crown 1 is preferably concavcd between the extremities ofthe crown, and the basal portion of the facing.

is preferably countersunk as at 3. The crown 1 is provided with adiagonal bore 4 extending from its lingual side to the base, so that thebore may be said to extend diagonally from the lingual side to the base.The bore 4 is preferably of circular cross section, and terminatescentrally of the counter sunk portion 3. The bore a is also preferably,although not necessarily, curved slightly.

In connection with the crown 1, there is employed a backing 5, of goldor any other suitable metal or material. The backing 5 iscon'iparatively thin and is shaped to conform to the lingual side of thecrown, the edges or marginal portions of the backing being flanged orworked over the edges of the lingual side of the crown. Attached at anacute angle to the backing 5 is a tubular or socket member 6, of anysuitable metal, preferably such as is inexpensive and. 11on-corrosive,and preferably having internal grooves or notches. The tube or socket 6is adapted to slip upwardly within the bore 4 of the crown, in orderthat the free end of the tube or socket will become flush with thecounter sunk portion 3. The tube or socket G is also preferably curvedslightly to conform to the curvature of the bore 4.

The numeral 7 designates the pin which is adapted to be inserted intothe root canal or cavity, the pin being preferably flat and tapered, andhaving the transverse depressions 8 in its sldes. The pm 7 is providedwith the head or flange 9 at its butt end,

and is further provided with a short shank 1O projecting from the head9. The shank 10 is preferably circular in cross section and of adiameter slightly smaller than the internal cross section of the tube orsocket 6. The shank 10 is provided with a plurality of annular orcircumferential grooves 11 forming collars or shoulders 12. The shank 10is also curved slightly to conform to the curvatures of the tube 6 andbore 4. The pin 7 may be constructed of any suitable metal adapted forthe purposes for which it is employed.

A tooth root 13 has been illustrated in Fig. 4c, the same having theordinary canal or cavity 14, which is designed Or adapted to receive thepin 7 The present crown is applied to the root as follows :-After thenatural tooth has been properly broken away to expose the root canal orcavity, and after the said canal or cavity has been properly treated,the pin 7 is secured within the canal 14 by means of suitable cement 15.The pin may be readily cemented within the root canal, the cementworking into the depressions or grooves 8 of the pin to securely lock oranchor the pin within the root,'with the head 9 and shank 10 of the pinexposed. V The shank 10., when the same is curved, is set'so as toproject rearwardly, as seen in Fig. 4. It is to be understood, ofcourse, that the pin is properly positioned before the cement sets orhardens. Then, after the tube or socket 6 of the backing has beeninserted into the bore of the crown, the said facing and backing may beapplied to the shank of the pin to test the crown. If the crown isuntrue with respect to the root, the same may be readily ground. toshape in a manner which will be apparent to those versed. in the art. Itis to be observed that the crown embodying the backing may be readilyslipped onto and off of the shank of the pin without creating any unduestrain upon the root. After the crown has been properly ground orshaped, the same, together with the backing, is secured in place. Thisis accomplished by placing any suitable cement 16 bet-ween the crown andthe root when the crown is applied, the cement running or flowing intothe tube 6 also. Then as the crown is slid or forced home, the tube inreceiving the shank of the pin, will cause the cement within the tube toenter the grooves 11 of the shank, and will cause that portion of thecement between the crown and root to conform to the irregularities ofthe adjoining portions of the crown and root. The superfluous cement isthen wiped away, and after the cement has hardened or set, the crownwill be rigidly anchored to theroot. The tooth thus provided will bevery rigid and durable, it being noted that thecrown is not onlycemented to the root, but is held by the backing which has the tubepassing through the crown and secured over the shank of the pin. Thepresent tooth is adapted to resist the strains to which it is subjected,such as the strain of mastication, in an efi'ective manner. It desired,the backing may be extended over the incisive edge of the crown, so thatthe backing will directly receive the strains of mastication.

The present tooth or crown, is particularly useful in connection withbridgework, the present crown being adapted to replace an anteriortooth, by breaking the anterior tooth away, so that the. present crownmay be applied as above indicated. When the present crown is applied, itwill be observed that the backing may serve as an abutment .for theattachment of a bridge or other support for the other tooth or teeth.

The present crown or tooth, may even be removed from the pln after thecrown has been cemented in position. This may be accomplished by pryingor otherwise loosening the crown from the tooth, the crown being twistedor otherwise loosened from the shank of the anchor pin. Attention isdirected to the fact that the anchor pin is perthe backing and crownbeing detachable to permit the application of the solder to the backingwithout heating the crown. The present crown may be employed with orwithout a cap or band to embrace the juncture between the crown and theroot.

Having thus described the invention, what is claimed as new is 1. In anartificial tooth, a crown having a bore therethrough, a root-engaginganchor pin, and a crown backing, the anchor pin and backing havingmembers adapted to be received by the said bore and to be securedtogether therein.

2. In an artificial tooth, a root-engaging anchor pin, and a crownbacking, a crown having a bore therethrough, one of the two firstmentioned parts having a socket insertible into the said bore, and theother of the two first mentioned parts having a portion insertible intothe said socket.

3. In an artificial tooth, a crown having a diagonal bore therethrough,a backing having an integral tube arranged at an acute angle relativethereto and insertible into the said bore, and a root-engaging anchorpin having a shank insertibleinto the said tube to be secured therein. I1

In testimony thatv I claimthe foregoing as my own, I have hereto aflixedmy signature in the presence of two witnesses.

A..G. SLOAN, C. W. FnNLAsoN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of latents.

Washington, D. U.

